Commit 581a7b26 authored by Masami Hiramatsu (Google)'s avatar Masami Hiramatsu (Google)
Browse files

selftests/ftrace: Add dynamic events argument limitation test case 

Add argument limitation test case for dynamic events.
This is a boudary check for the maximum number of the probe
event arguments.

Link: https://lore.kernel.org/all/174055078295.4079315.14702008939511417359.stgit@mhiramat.tok.corp.google.com/



Signed-off-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
parent 168ccc9b

tools/testing/selftests/ftrace/test.d/dynevent/dynevent_limitations.tc

0 → 100644
+42 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Checking dynamic events limitations

# requires: dynamic_events "imm-value":README



# Max arguments limitation

MAX_ARGS=128

EXCEED_ARGS=$((MAX_ARGS + 1))



check_max_args() { # event_header

  TEST_STRING=$1

  # Acceptable

  for i in `seq 1 $MAX_ARGS`; do

    TEST_STRING="$TEST_STRING \\$i"

  done

  echo "$TEST_STRING" >> dynamic_events

  echo > dynamic_events

  # Error

  TEST_STRING="$TEST_STRING \\$EXCEED_ARGS"

  ! echo "$TEST_STRING" >> dynamic_events

  return 0

}



# Kprobe max args limitation

if grep -q "kprobe_events" README; then

  check_max_args "p vfs_read"

fi



# Fprobe max args limitation

if grep -q "f[:[<group>/][<event>]] <func-name>[%return] [<args>]" README; then

  check_max_args "f vfs_read"

fi



# Tprobe max args limitation

if grep -q "t[:[<group>/][<event>]] <tracepoint> [<args>]" README; then

  check_max_args "t kfree"

fi



# Uprobe max args limitation

if grep -q "uprobe_events" README; then

  check_max_args "p /bin/sh:10"

fi